English Meaning & Definitions
The cardinal number that is the sum of twenty and one; the numeral 21 or XXI.
- “The house at the end of the street is number 21.”
- “She is turning 21 next Tuesday.”
A card game, also known as blackjack, where the object is to accumulate cards with a total point value as close to 21 as possible without exceeding it.
- “The casino floor was crowded with people playing 21.”
- “He hit on a sixteen and luckily got a five to make 21.”
Amounting to twenty-one in number.
- “There are 21 chapters in the new novel.”
- “The team won 21 games during the regular season.”
English Synonyms & Near Equivalents
Comprehensive Thesaurus Breakdown
Compare formal, informal, literary synonyms and register nuances for “21”.
The number 21 is derived from the Old English 'twentig' (two tens) and 'ān' (one). Historically, it has been significant as the age of majority in many jurisdictions, symbolizing the transition to full legal adulthood. In mathematics, it is a triangular number and a Fibonacci number.
Think of 'Blackjack' or the 'Key to the Door' age.
Frequently Asked Questions About “21”
1. What is the meaning of “21” in English?
In English, 21 (noun) is defined as: “The cardinal number that is the sum of twenty and one; the numeral 21 or XXI.”.
2. How do you use “21” in a sentence?
“The house at the end of the street is number 21.”
3. What are English synonyms of “21”?
4. What is the etymology and word origin of “21”?
The number 21 is derived from the Old English 'twentig' (two tens) and 'ān' (one). Historically, it has been significant as the age of majority in many jurisdictions, symbolizing the transition to full legal adulthood. In mathematics, it is a triangular number and a Fibonacci number.
🇬🇧More English Words to English
View all English words →A measurement of time indicating an instantaneous occurrence or a state where no time has elapsed.
The base unit of time in the International System of Units (SI), equal to the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom.
A specific duration of time equal to one hour and forty-six minutes and twelve seconds.
The cardinal number equal to one thousand million (1,000,000,000), expressed in scientific notation as 10^9.